Well, why not add when holding a certain type of weapon will give you a potion effect? For example: When you're holding a heavy weapon (rocket launcher and etc.), you will have a Slowness effect, and when you're holding a pistol will give you a Speed Boost effect. Make it so that people can create fantasy weapons with special effects. I'm currently developing some new weapons for my 2nd version of my modpack, so I hope you can implement this idea into your mod. Thanks.

Yeah, this sounds great. With this, you might even be able to make a riot shield by adding Resistance to the riot shield.